Rosh Hashanah 7B

לא ימסרם לצבור יפה יפה, קא משמע לן.

he will not transfer them over to the public without reservation, and in his heart he will hold on to them as his own, therefore the baraita teaches us that this is not a matter of concern.

ותנא דידן? כיון דקתני: אם הביא יצא ⁠— לא פסיקא ליה.

The Talmud asks: And why didn’t the tanna of our Mishnah count the 1st of Nisan as the New Year for shekels? The Talmud answers: The tanna of the Mishnah lists only definite New Years. Since it is taught: If one brought them from the old contribution, he has fulfilled his obligation, he could not state this New Year as a definite rule, and so he did not teach it.

ויש אומרים: אף לשכירות בתים. תנו רבנן: המשכיר בית לחבירו לשנה ⁠— מונה שנים עשר חודש מיום ליום. ואם אמר ״לשנה זו״, אפילו לא עמד אלא באחד באדר, כיון שהגיע יום אחד בניסן ⁠— עלתה לו שנה.

§ It was taught in the baraita: And some say that the 1st of Nisan is also the New Year for the renting of houses. A baraita states the following baraita: If one rents out a house to another person for a year, he counts 12 months from day to day. But if he said that he was renting it for this year, then even if the agreement was made only on the first of Adar, once the 1st of Nisan arrived one month later, it is counted as a year, and the rental contract comes to end.

ואפילו למאן דאמר יום אחד בשנה חשוב שנה ⁠— שאני הכא, דלא טרח איניש למיגר ביתא לבציר מתלתין יומין.

The Talmud comments: Even according to the one who said that one day in a year is considered a year, it is different here, with regard to rental halakhot, as a person does not take the trouble to rent a house for less than 30 days. Therefore, if one rented a house after the first of Adar, the remaining days of Adar are not considered a full year.